Introduction to the new and time processing of Java 8

In Java 8, new date and time processing characteristics have been introduced, and more powerful and simple ways are provided to handle the date and time.These new features are based on the Joda-Time library, and provide better API design, as well as more comprehensive support for date and time. 1. LocalDate and LocalTime Class: Java 8 introduces two new classes for processing date and time.LocalDate classes are used for processing dates, and LocalTime classes are used for processing time.These two categories provide various methods to obtain each part of the date and time, such as the year, month, day, hour, minute, minute, second, and so on.The following is an example code: // Create a localdate example LocalDate date = LocalDate.now(); // Get the year int year = date.getYear(); // Get the month Month month = date.getMonth(); // Get the day int day = date.getDayOfMonth(); 2. LocalDateTime class: In addition to the date and time of processing, Java 8 also introduced a new LocalDateTime for the combination of date and time.The LocalDateTime class combines the characteristics of the LocalDate and LocalTime classes, which can provide more flexible date and time processing functions. At the same time, it also provides various operation methods, such as addition and subtraction days, hours, minutes, and so on. // Create a localDateTime instance LocalDateTime dateTime = LocalDateTime.now(); // Get the year, month, month and day int year = dateTime.getYear(); Month month = dateTime.getMonth(); int day = dateTime.getDayOfMonth(); int hour = dateTime.getHour(); int minute = dateTime.getMinute(); int second = dateTime.getSecond(); 3. DateTimeFormatter class: Java 8 introduced a new date and time formatting class DateTimeFormatter for the formatting of the date and time format into a specified string form, or the string parsing into the date and time.The DateTimeFormatter class provides a variety of predetermined formatting modes, and also supports custom formatting patterns.The following is an example code: // Create an instance of DateTimeFormatter DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd"); // The formatting date is a string String formattedDate = date.format(formatter); // Analyze the string to the date LocalDate parsedDate = LocalDate.parse("2019-01-01", formatter); 4. New API method: In addition to the new date and time, Java 8 also provides some new API methods to handle the date and time.These include the comparison of the current date, time, date and time of obtaining the current date, time, and time according to the designated time zone, and so on.Here are some commonly used example code: // Get the current date and time according to the designated time zone ZonedDateTime zonedDateTime = ZonedDateTime.now(ZoneId.of("Asia/Shanghai")); // Compare two dates LocalDate date1 = LocalDate.of(2019, 1, 1); LocalDate date2 = LocalDate.of(2020, 1, 1); int result = date1.compareTo(date2); // The calculation date difference Period period = date1.until(date2); int years = period.getYears(); int months = period.getMonths(); int days = period.getDays(); All in all, Java 8 provides a new set of date and time processing features, including LocalDate, LocalTime, LocalDateTime and other categories, as well as the DateTimeFormatter class and various new API methods.These new features make the date and time processing easier and flexible, which greatly improves development efficiency.